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About DSP's explanation

The term DSP is becoming more and more widely used in CCTV industry. DSP (Digital Signal Processing) is the abbreviation of digital signal processing. The DSP chip improves the video processing and operation performance of the camera.

FLICKERLESS (without flashing)

The power frequency is 50Hz, CCD accumulation time is 1/50 seconds, if you use the NISC camcorder, the vertical synchronization frequency is 60Hz, this will cause the visual images are not synchronized, appear on the monitor flashing; conversely, with standard PAL camera in the 60Hz power supply for the area will also have this phenomenon. In order to overcome this phenomenon, in the electronic shutter set no flashing mode files, the NISC standard camera provides 1/100 seconds, providing a fixed shutter speed of 1/120 seconds for PAL camcorder, can prevent image monitor flicker.

Lens control signal

VIDEO/DC (camera control signal selection switch control signal): ALC auto iris lens has two kinds, when the DC control signal of the auto iris lens installed in the camera, should choose the position of DC, need to install auto iris lens video control signal, should choose the location of VIDEO.

Synchronous selection

LL/INT (synchronous selector switch): this switch is used to select the camera synchronization mode, INT is the internal synchronization 2, 1 interlaced synchronization; LL is the power synchronization. Some cameras also have a LL PHASE power synchro phase controller. When the camera is used for the synchronous state of the power supply, the device can adjust the phase of the video output signal, and the range of adjustment is probably about one frame.

Backlight compensation

BLC ON/OFF (backlight compensation switch): when the powerful and useless background lighting affects the sharpness of the important objects in the center, the switch should be switched to the ON position. Note: when the head and matched or rapidly changing lighting, recommended the switch in the OFF position, because in the ON position, the lens aperture is slow; if desired objects in the image center, backlight compensation may not give full play to the role of.

Automatic brightness control / electronic brightness control

ALC/ELC (automatic brightness control / electronic brightness control): when you select ELC, the electronic shutter according to the incoming light brightness and continuously and automatically change the exposure time of CCD image sensor (from 1/50 to 1/10000 seconds adjustable). In this mode, you can replace the ALC automatic iris lens with a fixed or manual diaphragm lens.

Automatic white balance

ATW ON/OFF (auto white balance): switch to ON, through the lens to detect the characteristics of the light source / color temperature, thus continuously and automatically set the white level, even if the characteristic / color temperature change can control the red and blue signal gain.

automatic gain control

AGC ON/OFF (automatic gain control): the camera has a signal from the CCD amplifier can be used to standard video amplifier, the amplification gain is equal to the higher sensitivity, but in the light of the environment will make the video amplifier overload, signal distortion. When the switch is at ON, the lens aperture is fully switched on under low brightness conditions, and the gain is automatically increased to obtain a clear image. When the switch is at OFF, the image with natural and low noise can be obtained at low brightness.

Installation and adjustment of CCD camera

Installation of lens: C type and CS type two, two threads are 1 inches 32 teeth, 1 inches in diameter, the difference is the distance from the target surface, CCD lens, C type mounting seat from the datum to the focal distance is 17.562 mm, than the CS distance CCD a special target the length of the connecting ring, CS focus distance is 12.5 mm.

Adjustment of the post shot intercept

After adjusting the focus lens, the adjustment of the intercept uses the camera automatic electronic shutter function to adjust the lens aperture to the maximum. The lens focus ring is adjusted according to the actual distance of the scene, and then the lens is adjusted to intercept until the image is clearest.

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